PAT A1108 Finding Average(20 分)
總結:
1.最坑的就是 printf("The average of %d number is %.2f", pp.size(), ps);當只有一個合法數字的時候輸出number
2.
程式碼:
#include<iostream>
#include<vector>
#include<string>
using namespace std;
vector<double> pp;
double old;
double isright(string p)
{
int xiaoshu = 0;
int dian = 0; bool flag = false;
for (int i = 0; i < p.size(); i++)
{
if (p[0] == '.'){ return 1.234567; break; }
if (p[i] == '-'&&i == 0)continue;
if (isdigit(p[i]) || p[i] == '.')
{
if (flag == true)xiaoshu++;
if (p[i] == '.'){ dian++; flag = true; }
}
else { return 1.234567; break; }
}
if (dian>1)return 1.234567;
if (xiaoshu>2)return 1.234567;
double sp = stod(p);
if (sp>1000 || sp<-1000)return 1.234567;
else return sp;
}
int main()
{
int n;
double sum = 0;
cin >> n;
for (int i = 0; i < n; i++)
{
string s;
cin >> s;
double sk = isright(s);
if (sk != 1.234567)
{
sum += sk;
pp.push_back(sk);
}
else cout << "ERROR: " << s << " is not a legal number" << endl;
}
if (pp.size() == 0)cout << "The average of 0 numbers is Undefined";
else if (pp.size() == 1) {
double ps = sum / pp.size();
printf("The average of %d number is %.2f", pp.size(), ps);
}
else {
double ps = sum / pp.size();
printf("The average of %d numbers is %.2f", pp.size(), ps);
}
return 0;
}